Bolthole Index

Pennington County, South Dakota

Zoning, building permits and septic rules in Lake Flat Township, South Dakota

Lake Flat Township is a township in Pennington County, South Dakota. Lake Flat Township adopts its own zoning, so inside its limits Lake Flat Township’s rules apply, not the county’s. Septic permits inside Lake Flat Township come from Pennington County. 3 rules below are quoted from official sources and independently re-checked, most recently on November 7, 2026. Rules for unincorporated land are on the Pennington County page.

Answers from the rulebook for Lake Flat Township

Lake Flat Township’s own rules

  • Building permitRequired

    Residential and commercial buildings or structures on unincorporated land inside Lake Flat Township #8, Pennington County, South Dakota; permits are administered under the Pennington County Zoning Ordinance.

    • A permit is required before erecting, constructing, enlarging, moving, or demolishing a building or structure.
    • Excavation, clearing, or land disturbance under 10,000 square feet may begin before approval, but no other construction may begin until the permit is signed and stamped approved by the Planning Director or designee.
    • Exceptions are accessory structures of 144 square feet or less that are not permanently anchored; fences or border walls eight feet or less high; snow fences on agricultural-zoned and agricultural-taxed property; and portable agricultural buildings moved at least once every five years.
    • A permit is not approved or valid until applicable fees are paid; a permanently founded building encroaching on a recorded easement cannot be approved unless the easement is vacated.

    accessory-structure exception size: <= 144 square feet (Only if not permanently anchored to the ground.) · fence-or-border-wall exception height: <= 8 feet · pre-permit land-disturbance threshold: < 10000 square feet (Only excavation, clearing, or land disturbance; other construction cannot begin before approved permit.)

    “A Building Permit is required prior to erecting, constructing, enlarging, moving, or demolishing any building or structure.”
  • Local zoningPresent (with conditions)

    Unincorporated land inside Lake Flat Township #8, Pennington County, South Dakota; the zoning authority is the Pennington County Board of County Commissioners, not Lake Flat Township.

    • The county ordinance applies to unincorporated land within the Board of County Commissioners' jurisdiction.
    “This Zoning Ordinance governs all unincorporated lands that are within the jurisdiction of the Board of County Commissioners for Pennington County, South Dakota.”
  • Who permits septicCounty (with conditions)

    On-site wastewater treatment systems inside Lake Flat Township #8, Pennington County, South Dakota.

    • Pennington County's septic section is enforceable within a township in Pennington County if that township does not regulate such systems or fails to regulate them in conformity with South Dakota or Pennington County rules and regulations.
    • The county ordinance incorporates ARSD Chapter 74:53:01 as minimum standards; inconsistent prior local minimum standards are superseded.
    • Covered premises must connect to public sewer when it is available or practicable; otherwise they must connect to an adequate OSWTS constructed, installed, and maintained under the county zoning ordinance.
    • For a constructed, altered, or replaced structure served by an OSWTS, the owner must obtain an operating license and verify system sizing; an OSWTS construction permit is required if the system must be upgraded to meet sizing requirements.
    “This Section shall also be enforceable within the boundaries of a sanitary district or township located within Pennington County, if the district or township does not regulate such systems or fails to regulate such systems in conformity with State of South Dakota or Pennington County rules and regulations.”

Each answer was extracted from an official source and independently re-checked against that source by a second reviewer. That is an evidence check, not legal advice. Rules change; confirm with the authority before you buy or build.

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